Gauge



W. Y. LANG June 1, 1943..

GAUGE Filed May 31, 19,41

2 Sheets-Sheet 1 INVENTOP WYLANG X ATTORNEY June 1, 1943. w LANG2,320,938

FIG.

INVENTOR WKLANG gram/Er Patented June 1, 1943 GAUGE Wilmarth Y. Lang,Towaco, N. J., assignor to Bell Telephone Laboratories, Incorporated,New York, N. 12, a corporation of New York Application May 31, 1941,Serial No. 396,098

7 Claims.

This invention relates to measuring instruments and particularly toindustrial inspection gauges of a type which may be identified as acomparator gauge.

In connection with the use of continuous form stationery, such asbusiness forms severably interconnected in continuous lengths and havingmarginal sprocket feed perforations, in type printing business machines,such as page printing telegraph receivers, it has been proposed toprovide for the rapid advancement of continuous form stationery from oneline printing position to another, such as by continuous orrapidlyrepeated line feeding operation. In accordance with one embodiment ofsuch apparatus, it has been proposed to provide in the stationery, inaccurately determined positions with respect to predetermined lineprinting points in the stationery, special perforations to be entered bya seeker or sensing instrumentality when the special perforation comesinto registry with the sensing instrumentality. Upon entering one of thespecial perforations in the stationery, the sensing instrumentalityoperates to arrest the page feeding mechanism, thereby arresting thestationery in a position to received printed message material at apredetermined line position thereon.

In certain well-known types of printing telegraph apparatus the linespacing of printed message material is six lines to the inch and it isnecessary that the special perforations for controlling the arrestmentof the stationery after rapid feeding operation, shall be dimensionedand positioned in the stationery with considerable accuracy in orderthat the portion of the page of stationery presented in the printingposition shall not be one line space above or below that in whichmessage material should be printed.

The maintenance of the desired accuracy of location and dimension of thespecial perforations necessitates inspection of finished forms by themanufacturer and supplier of the stationery and similar inspection of atleast randomly selected ones of the forms by purchasers of supplies ofsuch stationery. The inspection of the perforations by actualmeasurement using ordinary geometrical instruments is a tedious, timeconsuming, and therefore relatively expensive operation.

Accordingly, it is an object of this invention to provide an inspectiongauge by means of which the degree of conformity of any specialperforation with a standard of comparison may be quickly observedvisually.

The invention features means for quickly and accurately positioning thegauge with respect to a special perforation to be inspected.

The invention also features means for causing the outline of the specialperforations to stand out in sharp contrast to the body of thestationery.

For a complete understanding of the invention reference may be had tothe following detailed description to be interpreted in the light of theaccompanying drawings in which:

Fig. 1 is a plan view showing a comparator gauge in accordance with thepreferred embodiment of the invention positioned with respect to aspecimen of stationery for the inspection of a special perforationtherein;

Fig. 2 is a perspective view of a specimen of continuous formstationery;

Fig. 3 is an elevational view, partly in section, taken on the line 3-3of Fig. 1;

Fig. 4 is a plan view of the comparator gauge alone;

Fig. 5 is a plan view of a supporting plate or counter for thecomparator gauge; and

Figs. 6 and 7 are fragmentary plan views, partly broken away, showingtwo different acceptable locations of a special perforation with respectto a standard of comparison carried by the gauge.

Referring now to the drawings and particularly to Fig. 2, the referencenumeral I I indicates I a specimen of continuous form stationery,successive forms being integral but separable along transverse severancelines on which successive forms are folded in zigzag form to provide asupply of stationery in the form of a stack. It will be understood thatthe supply of stationery could be in the form of a roll instead of in astack of zigzag folded forms. Each form may have suitable rulingsthereon to provide appropriate places for various types of messagematerial, such as the name and address of a purchaser or consignee,lines for quantity, description and price information as to merchandise,a line for a total of the several aggregates of price items and linesfor any other special information that may be pertinent to particulartransactions.

The forms i l are provided with marginal perforations I? of uniform sizeand spacing for cooperation with sprocket feed pins carried by thecylindrical platen of a type printing business machine and,particularly, of a page printing telegraph recorder. The feeding ofcontinuous form stationery by means of sprocket feed mechanism isdisclosed in Patent 1,983,586 granted December 11, 193,4 to E. F. Watsonet a1,

It will be apparent that in the form H there are several line printingpositions at which predetermined types of message material are to beprinted on every form. For example, immediately above the legend Sold tois a line printing space divided into sections to receive in printedform certain kinds of information, such as a date, order numbers,salesmans number, etc. Since any such form upon which message materialis to be printed will receive at least one item in the body of the formunder the heading Quantity, Description, etc., each form, in the courseof receiving printed message material will have its line numbered 1brought into the printing position. Finally, every form will receiveprinted message material in the line identified Total.

In order to effect the rapid advancement of a business form from oneprinting line position to another, the cessation of a multiple linefeeding operation of the printer and the arrestment of a form at severalsuccessive points in which the first line of a series of lines ofmessage material is to be printed, the page form II is provided with aplurality of special perforations l3 closely associated with theright-hand row of sprocket feed perforations i2. In the type ofstationery shown in Fig. 2 each of the special perforations 13, which isrectangular in contour, partially merges with a feed perforation 12. Theupper and middle ones of the perforations i3 are identically positionedwith respect to the feed perforations i2 with which they merge and havetheir upper edges substantially on a radius of the sprocket feedperforation extending transversely of the paper. The lowermost specialperforation l3 differs in relation to the sprocket feed perforation i2with which it merges from the other two special perforations shown, inthat a radius of the feed perforation extending transversely of the pagewould substantially bisect the rectangular special perforation. A thirdpossible location of a special perforation, which is within thecontemplation of the invention but is not shown in Fig. 2, is aperforation which has its lower edge substantially on a radius of itsassociated sprocket feed perforation extending transversely of the page.

The uppermost of the special perforations I3 is so positionedlongitudinally of the page as to accommodate a sensing instrumentalitycontained in the printing telegraph receiver and arranged to terminate amultiple line feeding operation of the printer with the spaceimmediately above the legend Sold to in position to receive appropriateprinted message material, and by means of ordinary line feed operationof the printer,

the name of the consignee or purchaser and address information may beprinted directly below the legend Sold to. The second of the specialperforations i3 is disposed longitudinally of the form H in position toarrest the multiple line feeding operation of the printer when the line1 is in print receiving position. Additional items may be recorded inthe additional numbered lines by ordinary line feed operation of theprinter. The last of the three special perforations is positioned tobring the line entitled Total into printing position. It will beunderstood that following the typing of the desired information in theline entitled Total if the multiple line feeding mechanism of theprinter is set in operation the forms will be advanced until theuppermost special perforation in the next form arrests the advancementof the forms in the position for the printing of information in thespace above the legend Sold to.

' The position of a special perforation l3 with respect to the sprocketfeed perforation l2 with which it merges determines the distance fromthe sprocket feed perforation at which a line of message material willbe printed on the page. As

previously skated, the middle special perforation on the page H effectsarrestinent of the page to present the line numbered 1 in printingposition. If the middle special perforation had been centered withrespect to the sprocket feed perioration, which arrangement isexemplified by the lowermost special perforation, it would cause thepage to be arrested one line feed position above the line numbered 1which, in a printer providing line feed steps of one-sixth of an inch,would be one-sixth inch above line 1. If the middle special perforationhad been disposed with its lower edge substantially coinciding with aradius of the sprocket feed perforation extending transversely of thepage, it would cause the arrestment of the page in position to print aline two line feed steps above the line 1 or onethird of an inch abovethat line. Normally, the sprocket feed perforations l2 are on one-halfinch centers, and since the three possible positions of a specialperforation with respect to a sprocket feed perforation determine threeprinting line positions spaced at intervals of one-sixth inch andtherefore representing an aggregate of one-half inch longitudinally ofthe page, it follows that the three possible positions of the specialperforations determine printing line positions occupying the spacelongitudinally of the page equal to the spacing between sprocket feedperforations and that any line printing position on the page may beselected by properly disposing a special perforation in one of the threepossible positions with respect to a particular sprocket feedperforation.

Under certain circumstances, the line feed mechanism of printingtelegraph receivers is adjusted to provide double line feed whereby anytwo adjacent lines are spaced on one-third inch centers. Under theseconditions the three possible positions of a special perforation withrespect to a sprocket feed perforation will determine three printingline positions occupying a space of one inch longitudinally of the page.

Referring now to Figs. 1, 3 and 4, the principal element of the gaugedevice for checking the dimensions and locations of the specialperforations I3 is a flat rectangular plate M of colorless transparentsheet material which may be of glass but is preferably a so-calledplastic such as that commercially available under the trade-name Lucite.

Adjacent to one edge the rectangular plate M has a row of holes oncenters corresponding to the centers of the sprocket feed holes 12 inthe stationery II. The holes in the plate l4 receive and retain, eitherby threaded engagement or by pressed fit, the shanks l6 of pins H, thebodies of which are similar to sprocket feed pins and are dimensioned tofit snugly into the sprocket feed perforation l2 in a page of stationeryI i for accurately positioning the plate !4 upon a page of stationery tobe inspected.

In the middle of the plate Hi, three pins I1 and their mounting holesare omitted from the row of pins and the surface of the plate M fromwhich the bodies of the pins extend has inscribed thereon, as by thinscratch lines, three rectangles IS in predetermined relation to thepoints where the axes of the omitted pins would be disposed,corresponding to the three possible locations of special perforations ISwith reference to a sprocket feed perforation I2. The left-handrectangle I8 has its right-hand end adjacent to the point where the axisof a pin would be if provided, the middle rectangle I8 is symmetricallydisposed with respect to the point where the axis of a pin would be, andthe righthand rectangle has its left-hand end adjacent to the pointwhere the axis of a pin would be. Each of the rectangles I8 has a lineI9 extending transversely near each end thereof .at a distance from theopposite end of the rectangle equal to the length of a perfect one of.the special perforations I3. Thus the distance from the right-hand lineI9 to the left-hand end of a rectangle I8 or the distance from theleft-hand line I9 to the right-hand end of the rectangle I8 is equal tothe length of a perfect special perforation. Similarly, each rectanglehas a longitinudally extending line 2I adjacent to each side thereof,the distance between one of the lines 2| and the opposite side of therectangle I 8 being equal to the width of a perfect one of the specialperforations I 3. The distance between one of the lines I9 and theadjacent end of the rectangle I8 represents the distance that a specialperforation I3 may vary in position longitudinally of the stationary IIand still be acceptable. The distance between one of the longitudinallyextending lines 2| and the adjacent side of the rectangle I8 representsthe distance that a special perforation I3 may vary laterally of thestationery II and still be acceptable.

It will be apparent from the foregoing that imaginary transverse linesmidway between the lines I9 and their adjacent ends of the rectangle I8would represent the ends of a perfectly positioned special perforationI3, and the positions of the left-hand and right-hand rectangles I8 maynow be described with greater accuracy. The left-hand rectangle is sopositioned that an imaginary line between its right-hand end and theright-hand line I9 would pass through the point at which the axis of apin I1 would be located. Similarly, the right-hand rectangle I8 would beso positioned that an imaginary line midway between its left-hand endand the left-hand line I9 would pass through the axis of a pin I! ifsuch a pin were provided. The location of the middle rectangle I8 withrespect to the axis of an omitted pin I! was previously identifiedaccurately.

For cooperation with the gauge plate I l there is provided a supportingplate or counter 22 preferably of opaque plastic material. The counterplate 22 is provided with a row of holes 23 on centers corresponding tothe centers of the pins I7 and the holes 23 are preferably substantiallylarger than the bodies of the pins I1 so that the plate I l may beplaced on top of the counter 22 with the pins II extending down into theholes 23 of the counter 22 quickly and easily without the necessity forcarefully aligning the pins I! with the holes 23. Preferably, thecounter plate 22 is thicker than the length of the bodies of pins I? sothat the counter plate 22 may be laid flat on a desk or table and thegauge plate I4 may be laid flat on the counter plate 22 with pins I'Iextending into the holes 23 in the counter plate 22 but not touching thesurface of the desk or table, thereby permitting the gauge plate I4 tohave surface engagement with the counter plate 22 over their entireareas. When the gauge plate I4 is thus positioned on the counter plate22, the inscribed rectangles I8 and lines I9. and 2! are on the lowersurface of the auge plate I4 and may be observed through the plate sinceit is transparent and colorless.

When a special perforation in a specimen of stationery I3 is to beinspected, the stationery is placed against the underside of the gaugeplate I4 with the special perforation in registration with that one ofthe three rectangles I3 which corresponds to the position of the specialperforation relative to a sprocket feed perforation I2, and the pins I!are fitted into the sprocket feed perforations I2 in the stationery.This definitely and fixedly locates the particular inspection rectangleI8 with respect to the special perforation to be inspected and obviatesall possibility of movement of the stationery with respect to the gaugeplate. Thereupon the gauge plate I4 with the stationery I3 mounted onthe pins I1 is placed flat upon the counter plate 22 with the pins I'Iextending into the holes 23 in the counter plate so that the stationeryII is confined between the gauge plate I4 and the counter plate 22. Thisassembly of the gauge parts and the stationery to be inspected is shownin plan view in Fig. 1 and in elevational view in Fig. 3.

The parts having been positioned as described in the foregoingparagraph, the outline of the special perforation to the particular I9and 2I of the may be observed in relation inscribed rectangle and linesgauge plate. Perferably, the counter plate 22 is of a color which willcontrast sharply with the color of the stationery being inspected sothat the outline of the special perforation wil1 stand out clearly inrelation to the rectangle I8 and the lines I9 and 2I. As is well known,business stationery is available commercially in a wide range of colors,one of the purposes for the range of colors being to render readilydistinguishable one type of business form from another when a number ofdifierent types of forms are used in one ofiice. In view of the factthat it may be necessary to use the gauge plate I4 and a counter 22 incombination with stationery of different colors, it is Within thecontemplation of this invention to provide opaque counters 22 of anumber of different colors so that for inspected, a counter 01? the areaof the any stationery that may be may be chosen which will set counterexposed by the special perforation under inspection in sharp con-' trastto the body of the stationery. In Fig. 1 and also in Figs. 6 and 7 thestationery II has been partially lined in the conventional manner forrepresenting the color orange, to indicate that the stationery is of adifferent color than the counter which is seen through the specialperforation I3 that is being inspected.

In Figs. 1, 6 and 7 the special perforation that has been shown forpurposes of illustration in registration with a rectangle I8 to beinspected is of the type shown near the bottom of the stationery II inFig. 2 and is of the type which, when perfectly dimensioned andpositioned, is bisected by a radial line of the associated sprocket feedperforation extending transversely of the page. Fig. 6 is an enlargedfragmentary view of the portion of the assembly which is involved in theinspection of the particular special perforation and the outline of thespecial perforation is shown by dotted lines. The outline shown in Fig.6 is that of a perfect special perforation in which the ends of theperforation are midway between the ends of the rectangle I8 and theiradjacent lines I9 and the sides of the perforation are midway betweenthe sides of the rectangle I8 and their adjacent lines 2|.

Permissible variation of the position of the special perforations 13 onthe stationary specimen II is restricted .to having the specialperforations [3 appear wholly within the rectangle l8. Fig. 'I shows oneof the limit positions of a special perforation l3, in which theleft-hand end of the special perforation coincides with the lefthand endof rectangle IS, the right-hand end of the special perforationcoincideswith the righthand line 19, the outer edge of the specialperforation coincides with the upper side of the rectangle l8 and theinner edge of the perforation coincides with the lower one of the lines2%. If any portion of the special perforation 13 appears outside therectangle IS the special perforation does not come within the limit ofacceptability and is subject to rejection.

As the positions of special perforations l3 vary with respect torectangle E8, the manner in which its ends divide the spaces between theends of rectangle l8 and the lines l9 and the manner in which the sidesof the perforations divide the spaces between the side of rectangle l8and the lines 21 vary. However, as the positions of special perforationsof the proper length and width vary, their ends, if not coinciding withone of the ends of rectangle l8 and one of the lines If], will dividethe spaces between the ends of rectangle !8 and the lines l9correspondingly and the sides of the special perforation, if notcoinciding with one of the sides of rectangle l8 and with one of thelines 2|, will divide the spaces between the sides of rectangle l8 andthe line 2| correspondingly. This affords a convenient means forobserving visually whether or not the specal perforations are ofacceptable length and width. If a special perforation l3 issignificantly too long or too short, its ends will appreciably dividethe spaces between the ends of rectangle l8 and lines l9 dissimilarly.If one end of a special perforation coincides with one end of rectangle18, the other end will fall within the space between the other end ofthe rectangle and the line l9, if the perforation is too long, or willfall within the space between the lines 19 if the perforation is tooshort. In the same way, the sides of an acceptable special perforationl3 should divide the spaces between the sides of the rectangles IB andthe line 2| similarly unless one of the sides of the special perforationI3 coincides with one of the sides of rectangle [8 in which case theother side of the perforation should coincide with the line 2| adjacentto the other side of the rectangle. If the sides of the perfora ion failto divide the spaces similarly or to coincide with one side of therectangle and one of the lines 2! by a visually appreciable amount, theperforation fails to comply with an acceptable standard and the specimenof stationery which contains the perforation should be rejected.

Near the lower right-hand corner of gauge plate [4 there is inscribed onthe same surface thereof as the rectangles 18 a large rectangle 26 whichencloses a small rectangle 21 one end and one side of which coincidewith one end and one side of rectangle 2'5. ,This combination ofrectangles serves as a comparator for closely gauging a specialperforation 13 as to size. The large rectangle 26 represents the maximumpermissible size of a special perforation, and the small rectangle 21represents the minimum size of a special perforation. A specialperforation I3 is gauged for size independently of the rectangles 18 byplacing the portion of a specimen of stationery which contains therectangle to be gauged between gauge plate [4 and counter plate 22 sothat one side and one end of the perforation to be inspected registerswith the common side and end of the two rectangles 26 and 21. For aperfo'ration having perfect dimensions, the other side and end should befound to be disposed between the spaced separated sides of therectangles 26 and 21 and between the spaced ends of those rectangles. Aperforation is acceptable if its area is not larger than that of thelarge rectangle 26 and is not smaller than that of the small rectangle21. The combination of rectangles 26 and 21 augments the rectangles l8and enables an accurate visual determination of the acceptability of aspecial perforation in those instances in which it may be somewhatdifficult to determine whether the ends of the perforations divide thespaces between the ends of a rectangle l8 and the lines I9correspondingly and whether the sides divide the spaces between the sideof a rectangle l8 and the line 2| correspondingly.

The gauge plat l4 also has inscribed on the lower surface thereof threeparallel lines 28. These lines represent the printing line positioncorresponding to each of the three rectangles [8. When a specialperforation i3 is placed in registry with one of the three rectanglesE8, the corresponding on of the lines 28 will indicate the point on thespecimen of stationery which will be presented in printing positionunder the multiple line feed arrestinent control of the particularspecial perforation !3. Since, as previously stated, the spacing of pinsll corresponds to that of the sprocket feed perforations I2 and the pinsare therefore on one-half inch centers, and since the thre possiblelocations of the special perforations with respect to a single sprocketfeed perforation represent printing line differences of one line feed orone-sixth inch, the spacing of printing line positions represented bythe three rectangles 48 on the gauge plate 14, they being associatedwith successive sprocket feed perforation positions, is one-half inchplus onesixth inch, the total of which is two-thirds inch and this isthe spacing between adjacent ones of the line 28. Thus the lines 28permit observation of whether or not a special perforation l3 underinspection is associated with the proper sprocket feed perforation.

Although a specific embodiment of the invention has been shown in thedrawings and described in the accompanying specification, it will beunderstood that the invention is not limited to such specific embodimentbut is capable of modification and rearrangement without departing fromthe spirit of the invention and within the scope of the appended claims.

What is claimed is:

l. A gauge for inspecting perforations in stationery which comprises atransparent plate, means carried by said plate adapted to penetrateperforations in said stationery other than a perforation to be inspectedfor locating said plate with one surface in engagement with a surface ofthe stationery, means inscribed in geometric outline form on said plateto be observed in superposed relation to a perforation under inspectionfor displaying visually the state of conformity of said perforations topredetermined tolerance limits, and a backing plate for supporting atleast a portion of the stationery to be inspected, said backing platehaving clearance apertures for loosely accommodating said penetrativelocating means.

2. A gauge for inspecting perforations in stationery which comprises acolorless transparent plate, means carried by said plate adapted topenetrate perforations in said stationery other than a perforation to beinspected for locating said plate with one surface in engagement with asurface of the stationery to be inspected, means inscribed on said platto be observed in superposed relation to a perforation under inspectionfor displaying visually the state of conformity of said perforation topredetermined tolerance limits, and a backing plat for at least aportion of a sheet of said stationery of a color sharply contrastingwith the color of said stationery for rendering conspicuous the portionof the surface of said backing plate exposed by said perforation, saidbacking plate having oversized apertures for readily accommodating saidpenetrative locating means.

3. A gauge for inspecting perforations in stationery which comprises atransparent plate, means carried by said plate for locating said platewith one surface thereof in engagement with a surface of the stationerycontaining the perforation to be inspected, a rectangle inscribed onsaid surface of the plate of a length and width greater than thepreferred length and Width of a perforation in said stationery, a lineinscribed transversely of said rectangle near each end thereof such thatthe distance from one of said lines to the opposite end of the rectangleis equal to the preferred length of a perforation, a line inscribedlongitudinally of said rectangle inside each side thereof such that thedistance from either of said longitudinally extending lines to theopposite side of the rectangle is equal to the preferred width of theperforation, said rectangle and longitudinal and transverse lines whensuperposed upon a perforation under the control of said locating meansserving to display visually the state of conformity of said perforationto predetermined tolerance limits of dimensions and of variation inlocation of said perforation.

4. A gauge for inspecting substantially reetangular feed controllingperforations in stationery which comprises a transparent plate, meanscarried by said plate for locating said plate with one surface thereofin engagement with a surface of a portion of a sheet of stationerycontaining a perforation to be inspected, a rectangle longer than aperfect one of said perforations by the amount that said perforation mayvary in position longitudinally thereof, and wider than a perfectperforation by an amount that said perforation may vary in positionlaterally thereof inscribed on said one surface of said plate, a lineinscribed transversely of said rectangle adjacent to each end at adistance from the other end thereof equal to the length of a perfectperforation, a line inscribed longitudinally of said rectangle adjacentto each side at a distance from the other side thereof equal to thewidth of a perfect perforation, said rectangle and longitudinal andtransverse lines adapted to be superposed upon a perforation to beinspected under the control of said locating means for displayingvisually the state of conformity of said perforation to predeterminedtolerance limits by being entirely within said rectangle, by having thesum of the area of the end zones set off by said transverse linesexposed by said perforation substantially equal to the area of one ofsaid end zones, and by having the sum of the areas in the side zones setoff by said longitudinal lines exposed by said perforation substantiallyequal to the area of one of said side zones.

5. A gauge for inspecting feed control perforations in stationery havingmarginal feed perforations which comprises a transparent plate, aplurality of pins spaced and dimensioned in accordance with saidmarginal perforations secured to said plate and extending outwardly fromone face thereof for locating said plate with respect to the stationeryto be inspected, means inscribed on said plate to be observed insuperposed relation to a feed control perforation under inspection asdetermined by the cooperation of said pins with said marginalperforations for displaying visually the state of conformity of saidfeed control perforation to predetermined tolerance limits, and abacking plate for supporting at least a portion of a sheet of stationeryto be inspected, said backing plate having portions cut away to receiveand loosely accommodate said pins.

6. A gauge for inspecting feed control perforations in stationery havingmarginal feed perforations which comprises a transparent plate, aplurality of pins spaced and dimensioned to correspond with saidmarginal perforations carried by said plate and extending outwardly fromone surface thereof for locating said plate with respect to thestationery to be inspected, means inscribed on said plate on the surfacefrom which said pins extend to be observed in superposed relation to afeed control perforation as determined by the cooperation of said pinswith said marginal perforations for displaying visually the state ofconformity of said feed control perforation to predetermined tolerancelimits, and a backing plate for supporting at least a portion of a sheetof stationery to be inspected, said backing plate having a plurality ofapertures substantially larger than said pins and spaced in accordancewith the spacing of said pins for loosely receiving and accommodatingsaid pins whereby said first-mentioned plate and said backing plate mayengage opposite surfaces of said stationery.

'7. A gauge for inspecting feed control perforations in stationeryhaving marginal feed perforations in which said feed controlperforations intersect certain of said marginal perforations in aplurality of predetermined ways, a plurality of pins spaced anddimensioned to correspond to said marginal perforations secured to saidplate and extending from one surface thereof for 10- cating said platewith respect to stationery to be inspected, means inscribed on saidplate corresponding to each of the possible positions of a feed controlperforation relative to a marginal perforation to be observed insuperposed relation as determined by the cooperation of said pins withsaid marginal perforation to a feed control perforation under inspectionfor displaying visually the state of conformity of said feed controlperforation to predetermined tolerance limits, the pins which wouldoverlap portions of said inscribed means in consequence of theintersecting relation of feed control perforations to marginalperforations being omitted, and a backing plate for supporting at leasta portion of a body of stationery to be inspected, said backing platehaving portions cut away to accommodate locating pins in all possiblepositions on said firstmentioned plate including the point at which pinswere omitted.

' WILMARTH Y. LANG.

